Brake shoe



R. B. POGUE BRAKE SHOE Filed March 18. 1929 March 1, 1932.

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.ll l.|!\ll lll Li wmww hbllhwrp- Patented. Mar. 1, 1932 UNITED STATESPATENT orrics ROBERT D. POGUE, O1 CHICAGO, ILLINOIS, ASBIGNOB 'lO mnnnrcnr mun: anon a FOUNDRY COMPANY, Oil wrumre'ron, nmwnm. A.CORPORATION OI rm- WARE ram anon Application filed arms is, me. mm Io.man.

This invention relates to railway brake shoes of the type having aductile metal back and its object is to provide a strong and substantialanchorage of the body of the shoe to the metal back to hold the bodysecurely to the back and to prevent parts of the body from falling awayin case of fracture.

A further object of the invention is to rovide a strong and ri id backwhich wil re- 10 sist tendency to straighten or flatten out in event offracture of the body and will maintain the fractured body in serviceablecondition and prevent the parts thereof from fallmg away. 15 And afurther object of the invention is to rovide a simple means for securelanchorin" the ends of the body to the bee plate.

in the accompanying drawings I have selected a locomotive shoe forillustrating the invention and referring thereto,

Fig. 1 is a side elevation,

Fig. 2 is a top plan view, and

Fig. 3 is a sectional view on the line 3-8 of Fig. 2.

Referring to the drawinfi, 5 isthe body, 6 is the bac plate and 7 is eattachin lug, these arts being, in general form an construction, wellknown in the brake shoe art. The body may be made of cast iron, with orwithout chilled portions or with inserts 8. The back plate and the lugare preferably made of steel and the plate is provided wi openings intowhich the body metal flows during the casting operation to embed theback plate in the body to form the back thereof. The In is engpged withthe back plate and embed ed in t a body in any suitable manner to secureit to the body.

The shoe is of the flanged type and the back plate is made accordinglyto cover the flanged as well as the flat art of the body. The flangedside edge 9 o the plate is embedded in the body and the opposite sideedge 10 of the plate is bent downward and is embedded in the body. Theopenings 13 in the flanged part of the plate are arran d in two serieson opposite sides of a me is] plane passing through the flanged part ofthe shoe and extending perpendicularly to the axis of the wheel withwhich the shoe is adapted to be used, the openings in each series being-{peed apart and sta red with relation to e o ings in the 0 er series,except at the en of the flange where the openings are opposite. Theopemntgls in one series in the flange do not overlap e openings in theother series and this leaves a continuous unbroken portion 12 betweenthe two series of stri s. extending throughout the length of the an ofthe back which stiflens the back and ed s to its rigidity; This is a.feature of importance in my invention because it helps to prevent theback from straightening or flattening duringh service when the bodfractures and, in is we helps to hold e fractured parts of the ytogether so that the shoe can continue in service and give eflicientbraking. It is well known that when the body of a shoe fractures thetendency duringilservice of the shoe is for the back to straig ten orflatten, thereby opening up the cracks in the body and making the shoeless eflicient in braki efiect and the anchorge of the body rtions tothe back less e ective and more ieble to brake awa from the back. But,if the normal rigi itv of the back can be maintained after the body isfractured, the parts of the body will be held together in substantiallythe position they occupied in the body before it was fractured, therebmaintaining the braking and anchoring e ciency.

The openings 13 are radially disposed to the center of the arcuateflange of the back and the walls of the openings are beveled at thesides of the o emngs longitudinally of the back so that e body metal isbuttoned in the openin s and is thereby securely anchored to the ba Theopenings are punched in a blank late and the arcuate flange on the plateis ormed which inclines the side walls of the openings longitudinally ofthe late with respect to each other to cause the body metal to form abutton 11 in the openings during the casting operation. The late is alsoprovided with a series of openings 16 adjacent the side ed IOand theseopenings are arranged in su stantial alinement and extend through thecorner 15 of the plate mid partly in the flat portion of the plateendpartly in the downturned marginal portion 10 of the plate. These holesare also stamped back to also produce buttons 14 on the body.

when the body metal solidifies in the casting operation. This buttoningof the body to the back at the flange and at the opposite edge of theshoe is highly important in providing a permanent anchorage of the bodyto the back, and it also has the effect of increasing the rigidity ofthe back .and maintaining the general shape and contour of the shoe.

I provide a plurality of openings 17 arranged in substantial alinementtransversely of theflat portion of the back at the end of the shoe toreceive the body metal and to anchor the ends of the body to the ends ofthe back. It is found in practice that this method of anchoring the bodyto the back at the ends of the shoe is especially eflieient; it providesa much larger area of connecting metal between the end stops 18 on theback of the shoe and the body of the shoe than has been customaryheretofore and this enlarged connectin area is divided in such a waythat strengt and rigidity of the back is not impaired at this portion ofthe back, and the anchoring of the end stops to the body and of the bodyand end stops to the back is made more substantial and efficient. I alsoprovide a pluralit of openings 19 in the flat portion. of the ack platebetween the arcuate flange and the downturned flange and these openingsmay be elongated, as shown, or in an other desired shape.

My invention provi es a brake shoe of strong and substantialconstruction in which the body is securel anchored at and between itsends to the bac plate so that in event of fracture of the body the partsthereof will be securely held together and the shoe will be maintainedin serviceable and efiicient condition. The arrangement of the openin inthe and a plate embedded in the back thereof, the plate having anarcuate flange on the flanged part of the body, and said flanged part ofthe plate having two series of spaced openings located respectivel onopposite sides of a medial plane passln through said flanged partof thebody and extendlng perpendicularly to the axis of the wheel.

2. A flanged brake shoe comprising a body and a plate embedded in theback thereof, the plate having an arcuate flange on the flanged part ofthe body and a downturned flange at its opposite marginal edge, thearcuate flanged part of the plate having two series of spaced openingslocated on opposite sides of an integral, continuous and unbrokencentrally disposed longitudinal strip portion, and the opposite flangedportion of the plate having a series of openings extending through thecorner of the plate formed by said flange,

the body metal extending into all of said openings and having a buttonanchor therein.

ROBERT B. POGUE.

arcuate flange and in the corner of t e plate formed by the downturnedflange is important because of the efiicient anchorage afiorded and thearrangement of the two series of openings in the arcuate flange onopposite sides of a continuous unbroken strip, with the openingsstaggered between the end portions of the plate, is important because ofthe added anchoring efi'ect without impairing the rigidity of the plate.

Changes in the form, construction and arrangement of parts of theinvention may be made to adapt it for different sizes and shapes ofshoes, or to meet other conditions, and I reserve the right to make allsuch changes as fairly fall within the scope of the following claims.

I claim:

1. A flanged brake shoe adapted for cooperation with a wheel andcomprising a body

